US4432272A - Motor operated fire damper - Google Patents
Motor operated fire damper Download PDFInfo
- Publication number
- US4432272A US4432272A US06/444,836 US44483682A US4432272A US 4432272 A US4432272 A US 4432272A US 44483682 A US44483682 A US 44483682A US 4432272 A US4432272 A US 4432272A
- Authority
- US
- United States
- Prior art keywords
- switch
- motor
- damper
- barrier
- ambient temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C2/00—Fire prevention or containment
- A62C2/06—Physical fire-barriers
- A62C2/12—Hinged dampers
- A62C2/14—Hinged dampers with two or more blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/76—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by means responsive to temperature, e.g. bimetal springs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/15—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre with parallel simultaneously tiltable lamellae
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
- F24F11/35—Responding to malfunctions or emergencies to fire, excessive heat or smoke by closing air passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
- F24F2013/1433—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means with electric motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
- F24F2013/144—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means with thermoactuators
Definitions
- This invention pertains to ventilation control devices, and more particularly to a fire or smoke damper for use in protecting the ventilation conduits of a building.
- Most buildings are subject to certain codes promulgated by appropriate governmental bodies which require that duct work and various communication channels in a building be protected with barriers which close off the duct or channel at strategic locations in case of ifre. These barriers help to prevent the spread of the fire through the building and also serve to prevent distribution of toxic smoke and fumes throughout the building through the ventilation system.
- fire and smoke dampers comprise frame mounted closures which may be interposed directly into the passages and conduits of the building.
- the closure is usually biased toward the flow blocking or closed position by one or more springs and is held in the standby or open position by a retainer incorporating a fusible link.
- Such links comprise a pair of separable elements interconnected with a eutectic solder which melts to permit the elements to separate when the ambient temperature reaches a predetermined level. The critical temperature is reached and exceeded at the onset of a fire proximal the damper and separation of the link elements permits the closure to be automatically moved to its closed position by the damper springs.
- motor operated damper which may be selectively re-opened to permit the passage of fluid once it has been operated.
- motor operated dampers have been suggested in the past, they generally have been found unacceptable or have not passed appropriate industry standard tests because they have been dependent upon the availability of electrical energy or the loss of such energy by destruction of electrical wires by fire for their primary fire protection function. A fire can interrupt the supply of such energy or may not interrupt the supply in all cases and the consequences from such uncertainty has retarded the use of heretofore available motor operated fire dampers.
- a primary object of the present invention to provide a damper which is operable with an electric motor for selectively opening the damper to vent smoke and fumes, yet which retains the capability of functioning in its primarily fire protection role even if the supply of electrical energy to the motor should be interrupted.
- Another important object of the invention is to provide such a damper which is highly reliable and which is capable of operation after long periods of standby service.
- Another object of the invention is to provide a damper which will immediately operate to close of fluid communication through the damper when the ambient temperature is elevated to a predetermined critical level, even if the electrical circuitry to the damper is not damaged by a fire yet which may be quickly and easily returned to its standby condition after the fire is extinguished.
- FIG. 1 is a front perspective view of a damper embodying the principles of this invention, parts being broken away to reveal details of construction;
- FIG. 2 is a schematic drawing of one form of control circuit for the damper of FIG. 1;
- FIG. 3 is a schematic drawing of another control circuit therefor.
- FIG. 4 is a schematic drawing of yet another control circuit therefor.
- damper 10 may be of any suitable construction capable of installation in a building fluid passagage such as an air conditioning or heating duct or the like for the purpose of closing off the duct in case of fire.
- damper 10 comprises a peripheral frame 12 having a plurality of generally rectangular blades 14 mounted for pivotal movement between generally horizontal positions as shown in the drawing and vertical blade positions wherein the blades overlap to close off the damper opening.
- Axles 16 extend longitudinally of the blades and transversely across the damper opening.
- the axles 16 are interconnected with linkage (not shown) whereby the rotation of one blade about its axle causes simultaneous rotation of the other blades so that the blades may be opened or closed together as a unit.
- An actuating motor 18 has an output shaft 20 coupled by linkage 22 with one of the blades 14 so that rotation of shaft 20 by the motor rotates all of the units about their respective shafts 16.
- Motor 18 is constructed with an internal torsion spring 24 which biases shaft 20 in a direction to close the damper blades when the motor is not energized. Conversely, when electrical energy is connected with the motor, the latter turns the shaft against the biasing force of spring 24 to rotate the damper blades to their open positions.
- a thermal responsive switch 26 is electrically connected with motor 18 and the source of electrical energy thereto.
- Switch 26 is of a type capable of operating responsive to the elevation of the ambient temperature above a predetermined amount.
- Switches found suitable for this purpose may comprise those having a bimetallic actuator capable of deforming in response to temperature elevation to interrupt the flow of electrical energy. Switches of this type are commercially available and one found suitable for the purpose is manufactured by Control Products Div., Texas Instruments, Inc., 30 Forest Street, Attleboro, Mass., and sold commercially under the tradename KLIXON.
- Damper 10 is installed in a building fluid passage at a critical location such as at a fire wall.
- the damper is constructed with a peripherally extending collar secured to frame 12 and adapted to be mated with the building fluid ducting, preferably during the construction of the building. Often dampers of this type must be installed in remote and relatively inaccessible locations.
- the damper is connected with a source of electrical energy when it is installed and motor 18 is of a type which rotates shaft 20 in the direction to maintain the damper blades in their opened position.
- Spring 24 is capable of exerting sufficient torque on shaft 20 to rotate the latter in the direction of the arrow in FIG. 1 to close the damper blades immediately upon the cessation of the flow of electrical energy to motor 18.
- FIG. 2 shows schematically a simplified electrical circuit suitable for the operation heretofore described.
- a manual switch 30 is interposed in the circuit.
- Switch 30 would normally be closed so that the motor would remain energized until the ambient temperature became elevated from a fire.
- Switch 30 could be opened manually if it ever became desirable to close the fluid passage for any reason even though the ambient temperature at the damper location had not reached a level sufficient for operating switch 26.
- the decision to close the damper could occur, for example, in the event that a fire broke out in some remote location of the building and it was desired to close the passage to prevent smoke and noxious fumes from migrating through a building ducting system.
- FIG. 3 shows another simplified schematic similar to FIG. 2 but with manual switch 32 connected in parallel with switch 26.
- This arrangement would have the benefit of permitting selective closing or opening of the damper blades by the operator even in the event that a fire would occur sufficiently close to the damper to cause the opening of switch 26.
- switch 32 could be closed to open the damper for selectively venting of smoke and the like through the ventilation system.
- FIG. 4 shows a control set up wherein manual switch 36 is a three position switch permitting the switch pole piece to be engaged with contact 38 to provide the normal standby operation of the damper with the damper blades held open by energized motor 18. If, for any reason, it would be desired to close the damper blades, the pole piece of the switch could be moved to contact 40 terminating electrical energy flow to the motor and permitting the blades to close under the torque provided by the spring. Further, if it were desired to reopen the damper and if the ambient temperature was sufficiently high to cause the opening of switch 26, the pole piece would be moved to contact 42 to reenergize the motor and open the damper blades.
Abstract
Description
Claims (5)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/444,836 US4432272A (en) | 1982-11-29 | 1982-11-29 | Motor operated fire damper |
KR1019830005161A KR910000228B1 (en) | 1982-11-29 | 1983-10-31 | Fire damper |
GB08329251A GB2130882B (en) | 1982-11-29 | 1983-11-02 | Motor operated fire damper |
CA000441734A CA1194356A (en) | 1982-11-29 | 1983-11-23 | Motor operated fire damper |
AU21752/83A AU557801B2 (en) | 1982-11-29 | 1983-11-28 | Motor operated fire damper |
MX199560A MX159277A (en) | 1982-11-29 | 1983-11-28 | IMPROVEMENTS IN PROTECTIVE GATE TO CONTROL FLUID FLOW THROUGH A BUILDING VENTILATION DUCT |
DE19833343038 DE3343038A1 (en) | 1982-11-29 | 1983-11-28 | PROTECTIVE DEVICE FOR FLOW CONTROL |
JP58225332A JPS59109742A (en) | 1982-11-29 | 1983-11-29 | Protective damper controlling fluid flow passing through ventilating conduit for building |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/444,836 US4432272A (en) | 1982-11-29 | 1982-11-29 | Motor operated fire damper |
Publications (1)
Publication Number | Publication Date |
---|---|
US4432272A true US4432272A (en) | 1984-02-21 |
Family
ID=23766553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/444,836 Expired - Lifetime US4432272A (en) | 1982-11-29 | 1982-11-29 | Motor operated fire damper |
Country Status (8)
Country | Link |
---|---|
US (1) | US4432272A (en) |
JP (1) | JPS59109742A (en) |
KR (1) | KR910000228B1 (en) |
AU (1) | AU557801B2 (en) |
CA (1) | CA1194356A (en) |
DE (1) | DE3343038A1 (en) |
GB (1) | GB2130882B (en) |
MX (1) | MX159277A (en) |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4519301A (en) * | 1984-01-12 | 1985-05-28 | Wetzel Lawrence E | Air flow balancing fire damper |
US4559867A (en) * | 1984-06-29 | 1985-12-24 | Philips Industrial Components, Inc. | Round damper and fusible link therefor |
US4581987A (en) * | 1985-05-30 | 1986-04-15 | Ecm Motor Co. | Fire damper actuator |
US4637296A (en) * | 1983-06-27 | 1987-01-20 | Mitsubishi Denki Kabushiki Kaisha | Air flow controlling apparatus |
US4738189A (en) * | 1986-07-21 | 1988-04-19 | Philips Industrial Components, Inc. | Pneumatically operated fire damper |
US4911065A (en) * | 1989-04-11 | 1990-03-27 | Philips Industrial Components Inc. | Damper with override control |
US4928583A (en) * | 1988-07-22 | 1990-05-29 | Taylor Harry L | Air flow control system |
US4936388A (en) * | 1986-09-17 | 1990-06-26 | Le Lande Jr Walter C | Fire suppression system |
US4977818A (en) * | 1988-07-22 | 1990-12-18 | Taylor Harry L | Air flow control system |
US4984637A (en) * | 1989-06-23 | 1991-01-15 | Finnigan Wilfred J | Electronic fire protection system |
US4991657A (en) * | 1986-09-17 | 1991-02-12 | Lelande Jr Walter C | Fire suppression system |
WO1994026352A1 (en) * | 1993-05-12 | 1994-11-24 | Nv Brandstopp Ab | Fire damper and a fire damper control system |
US5584312A (en) * | 1994-11-21 | 1996-12-17 | Tomkins Industries, Inc. | Fire damper for ceiling diffuser |
US5674125A (en) * | 1995-01-24 | 1997-10-07 | American Standard Inc. | Fresh air flow modulation device |
US5730653A (en) * | 1996-04-03 | 1998-03-24 | Tomkins Industries, Inc. | Compact damper with over center latch |
US5730652A (en) * | 1996-04-04 | 1998-03-24 | Tomkins Industries, Inc. | Damper with stationary pitot-static sensing vanes |
US5755069A (en) * | 1997-03-04 | 1998-05-26 | Specialty Metal Fabricators, Inc. | Louver assembly and method for installing a louver assembly |
US5779540A (en) * | 1997-02-07 | 1998-07-14 | Nailor Industries Of Texas, Inc. | Fluid flow control damper |
US5810662A (en) * | 1996-04-03 | 1998-09-22 | Tomkins Industries, Inc. | Compact smoke and fire damper with over center latch |
US20040209566A1 (en) * | 2003-04-17 | 2004-10-21 | Guy Caliendo | Multi-mode damper actuator |
US20100114377A1 (en) * | 2008-10-31 | 2010-05-06 | Seifert Mtm Systems Malta Ltd. | Air conditioning device for switchgear cabinets |
US20120037713A1 (en) * | 2009-03-02 | 2012-02-16 | Belimo Holding Ag | Drive for fire damper |
US20130340361A1 (en) * | 2009-06-03 | 2013-12-26 | Bripco Bvba | Data Centre |
EP2592359B1 (en) * | 2011-11-08 | 2017-07-26 | Trox GmbH | Fire protection flap with a housing and a pivotable shut-off valve which can be pivoted around a pivoting axle, in particular a central pivoting axle |
BE1023813B1 (en) * | 2016-01-28 | 2017-07-31 | Safran Aero Boosters S.A. | AIRCRAFT TURBOMACHINE TEST BENCH |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2223942A (en) * | 1988-09-07 | 1990-04-25 | Gilberts | Fire damper |
DE9208345U1 (en) * | 1992-06-23 | 1992-11-12 | Gebrueder Trox, Gmbh, 4133 Neukirchen-Vluyn, De | |
FI92372C (en) * | 1992-08-12 | 1998-02-10 | Kvaerner Masa Yards Oy | Fire damper device |
US5533929A (en) * | 1993-12-29 | 1996-07-09 | Attridge, Jr.; Russell G. | Remotely trippable and resettable damper |
DE4431193A1 (en) * | 1994-09-01 | 1998-10-01 | Bartholomaeus Gmbh | Fire protector for ventilation duct or drain pipe |
KR100345091B1 (en) * | 2000-05-19 | 2002-07-24 | 주식회사 시공테크 | Damper for preventing air and fire |
DE10104923C1 (en) * | 2001-01-25 | 2002-10-02 | Lta Lufttechnische Komponenten | Fireproof flap for ventilation systems such as ventilation ducts in buildings, has flap leaf which consists of perforated plate on both sides and filled with insulating material |
DE102007040632A1 (en) * | 2007-08-27 | 2009-03-05 | Özpolat, Ilgas, Dipl.-Ing. | wall box |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA964682A (en) * | 1971-04-12 | 1975-03-18 | Frank D. Roberts | Closure operator |
US4039123A (en) * | 1975-08-19 | 1977-08-02 | Flair Manufacturing Corporation | Automatic stack damper |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1038429A (en) * | 1964-11-13 | 1966-08-10 | Henry Bayard Clark | Motor operated fire doors with automatic door release |
ZA754627B (en) * | 1975-07-18 | 1977-03-30 | E Pantland | Fire dampers |
US4334570A (en) * | 1980-09-22 | 1982-06-15 | Reed National Corp. | Fire and smoke damper |
-
1982
- 1982-11-29 US US06/444,836 patent/US4432272A/en not_active Expired - Lifetime
-
1983
- 1983-10-31 KR KR1019830005161A patent/KR910000228B1/en not_active IP Right Cessation
- 1983-11-02 GB GB08329251A patent/GB2130882B/en not_active Expired
- 1983-11-23 CA CA000441734A patent/CA1194356A/en not_active Expired
- 1983-11-28 DE DE19833343038 patent/DE3343038A1/en not_active Withdrawn
- 1983-11-28 MX MX199560A patent/MX159277A/en unknown
- 1983-11-28 AU AU21752/83A patent/AU557801B2/en not_active Ceased
- 1983-11-29 JP JP58225332A patent/JPS59109742A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA964682A (en) * | 1971-04-12 | 1975-03-18 | Frank D. Roberts | Closure operator |
US4039123A (en) * | 1975-08-19 | 1977-08-02 | Flair Manufacturing Corporation | Automatic stack damper |
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4637296A (en) * | 1983-06-27 | 1987-01-20 | Mitsubishi Denki Kabushiki Kaisha | Air flow controlling apparatus |
US4519301A (en) * | 1984-01-12 | 1985-05-28 | Wetzel Lawrence E | Air flow balancing fire damper |
US4559867A (en) * | 1984-06-29 | 1985-12-24 | Philips Industrial Components, Inc. | Round damper and fusible link therefor |
US4581987A (en) * | 1985-05-30 | 1986-04-15 | Ecm Motor Co. | Fire damper actuator |
US4738189A (en) * | 1986-07-21 | 1988-04-19 | Philips Industrial Components, Inc. | Pneumatically operated fire damper |
US4936388A (en) * | 1986-09-17 | 1990-06-26 | Le Lande Jr Walter C | Fire suppression system |
US4991657A (en) * | 1986-09-17 | 1991-02-12 | Lelande Jr Walter C | Fire suppression system |
US4977818A (en) * | 1988-07-22 | 1990-12-18 | Taylor Harry L | Air flow control system |
US4928583A (en) * | 1988-07-22 | 1990-05-29 | Taylor Harry L | Air flow control system |
US4911065A (en) * | 1989-04-11 | 1990-03-27 | Philips Industrial Components Inc. | Damper with override control |
US4984637A (en) * | 1989-06-23 | 1991-01-15 | Finnigan Wilfred J | Electronic fire protection system |
WO1994026352A1 (en) * | 1993-05-12 | 1994-11-24 | Nv Brandstopp Ab | Fire damper and a fire damper control system |
US5584312A (en) * | 1994-11-21 | 1996-12-17 | Tomkins Industries, Inc. | Fire damper for ceiling diffuser |
US5674125A (en) * | 1995-01-24 | 1997-10-07 | American Standard Inc. | Fresh air flow modulation device |
US5741180A (en) * | 1995-01-24 | 1998-04-21 | American Standard Inc. | Fresh air flor modulation device |
US6049299A (en) * | 1995-01-24 | 2000-04-11 | American Standard Inc. | Dithering an analog signal to improve measurement |
US5810662A (en) * | 1996-04-03 | 1998-09-22 | Tomkins Industries, Inc. | Compact smoke and fire damper with over center latch |
US5730653A (en) * | 1996-04-03 | 1998-03-24 | Tomkins Industries, Inc. | Compact damper with over center latch |
US5730652A (en) * | 1996-04-04 | 1998-03-24 | Tomkins Industries, Inc. | Damper with stationary pitot-static sensing vanes |
US5779540A (en) * | 1997-02-07 | 1998-07-14 | Nailor Industries Of Texas, Inc. | Fluid flow control damper |
US5987836A (en) * | 1997-03-04 | 1999-11-23 | Specialty Metal Fabrications, Inc. | Louver assembly and method for installing a louver assembly |
US5755069A (en) * | 1997-03-04 | 1998-05-26 | Specialty Metal Fabricators, Inc. | Louver assembly and method for installing a louver assembly |
US20040209566A1 (en) * | 2003-04-17 | 2004-10-21 | Guy Caliendo | Multi-mode damper actuator |
US7033268B2 (en) * | 2003-04-17 | 2006-04-25 | Siemens Building Technologies, Inc. | Multi-mode damper actuator |
US20100114377A1 (en) * | 2008-10-31 | 2010-05-06 | Seifert Mtm Systems Malta Ltd. | Air conditioning device for switchgear cabinets |
US9327148B2 (en) * | 2009-03-02 | 2016-05-03 | Belimo Holding Ag | Drive for fire damper |
US20120037713A1 (en) * | 2009-03-02 | 2012-02-16 | Belimo Holding Ag | Drive for fire damper |
US20130340361A1 (en) * | 2009-06-03 | 2013-12-26 | Bripco Bvba | Data Centre |
US9069534B2 (en) * | 2009-06-03 | 2015-06-30 | Bripco Bvba | Data centre |
US9648787B2 (en) | 2009-06-03 | 2017-05-09 | Bripco Bvba | Data centre |
US9723761B2 (en) | 2009-06-03 | 2017-08-01 | Bripco Bvba | Data centre |
US10485142B2 (en) | 2009-06-03 | 2019-11-19 | Bripco Bvba | Data Centre |
EP2592359B1 (en) * | 2011-11-08 | 2017-07-26 | Trox GmbH | Fire protection flap with a housing and a pivotable shut-off valve which can be pivoted around a pivoting axle, in particular a central pivoting axle |
BE1023813B1 (en) * | 2016-01-28 | 2017-07-31 | Safran Aero Boosters S.A. | AIRCRAFT TURBOMACHINE TEST BENCH |
EP3199206A1 (en) * | 2016-01-28 | 2017-08-02 | Safran Aero Boosters SA | Aircraft turbine engine test bench |
CN107013331A (en) * | 2016-01-28 | 2017-08-04 | 赛峰航空助推器股份有限公司 | Test cell for aircraft turbine engine |
Also Published As
Publication number | Publication date |
---|---|
AU557801B2 (en) | 1987-01-08 |
GB8329251D0 (en) | 1983-12-07 |
GB2130882B (en) | 1986-06-04 |
MX159277A (en) | 1989-05-11 |
JPS59109742A (en) | 1984-06-25 |
GB2130882A (en) | 1984-06-13 |
KR910000228B1 (en) | 1991-01-23 |
KR840007167A (en) | 1984-12-05 |
DE3343038A1 (en) | 1984-05-30 |
CA1194356A (en) | 1985-10-01 |
AU2175283A (en) | 1984-06-07 |
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